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super.c
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super.c
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/*
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
*
* Trivial changes by Alan Cox to add the LFS fixes
*
* Trivial Changes:
* Rights granted to Hans Reiser to redistribute under other terms providing
* he accepts all liability including but not limited to patent, fitness
* for purpose, and direct or indirect claims arising from failure to perform.
*
* NO WARRANTY
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <asm/uaccess.h>
#include "reiserfs.h"
#include "acl.h"
#include "xattr.h"
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/quotaops.h>
#include <linux/vfs.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/crc32.h>
#include <linux/seq_file.h>
struct file_system_type reiserfs_fs_type;
static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
int is_reiserfs_3_5(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
strlen(reiserfs_3_5_magic_string));
}
int is_reiserfs_3_6(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
strlen(reiserfs_3_6_magic_string));
}
int is_reiserfs_jr(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
strlen(reiserfs_jr_magic_string));
}
static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
{
return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
is_reiserfs_jr(rs));
}
static int reiserfs_remount(struct super_block *s, int *flags, char *data);
static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int reiserfs_sync_fs(struct super_block *s, int wait)
{
struct reiserfs_transaction_handle th;
/*
* Writeback quota in non-journalled quota case - journalled quota has
* no dirty dquots
*/
dquot_writeback_dquots(s, -1);
reiserfs_write_lock(s);
if (!journal_begin(&th, s, 1))
if (!journal_end_sync(&th))
reiserfs_flush_old_commits(s);
reiserfs_write_unlock(s);
return 0;
}
static void flush_old_commits(struct work_struct *work)
{
struct reiserfs_sb_info *sbi;
struct super_block *s;
sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
s = sbi->s_journal->j_work_sb;
spin_lock(&sbi->old_work_lock);
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
reiserfs_sync_fs(s, 1);
}
void reiserfs_schedule_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
unsigned long delay;
if (s->s_flags & MS_RDONLY)
return;
spin_lock(&sbi->old_work_lock);
if (!sbi->work_queued) {
delay = msecs_to_jiffies(dirty_writeback_interval * 10);
queue_delayed_work(system_long_wq, &sbi->old_work, delay);
sbi->work_queued = 1;
}
spin_unlock(&sbi->old_work_lock);
}
static void cancel_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
spin_lock(&sbi->old_work_lock);
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
}
static int reiserfs_freeze(struct super_block *s)
{
struct reiserfs_transaction_handle th;
cancel_old_flush(s);
reiserfs_write_lock(s);
if (!(s->s_flags & MS_RDONLY)) {
int err = journal_begin(&th, s, 1);
if (err) {
reiserfs_block_writes(&th);
} else {
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
1);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
reiserfs_block_writes(&th);
journal_end_sync(&th);
}
}
reiserfs_write_unlock(s);
return 0;
}
static int reiserfs_unfreeze(struct super_block *s)
{
reiserfs_allow_writes(s);
return 0;
}
extern const struct in_core_key MAX_IN_CORE_KEY;
/*
* this is used to delete "save link" when there are no items of a
* file it points to. It can either happen if unlink is completed but
* "save unlink" removal, or if file has both unlink and truncate
* pending and as unlink completes first (because key of "save link"
* protecting unlink is bigger that a key lf "save link" which
* protects truncate), so there left no items to make truncate
* completion on
*/
static int remove_save_link_only(struct super_block *s,
struct reiserfs_key *key, int oid_free)
{
struct reiserfs_transaction_handle th;
int err;
/* we are going to do one balancing */
err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
if (err)
return err;
reiserfs_delete_solid_item(&th, NULL, key);
if (oid_free)
/* removals are protected by direct items */
reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
return journal_end(&th);
}
#ifdef CONFIG_QUOTA
static int reiserfs_quota_on_mount(struct super_block *, int);
#endif
/* look for uncompleted unlinks and truncates and complete them */
static int finish_unfinished(struct super_block *s)
{
INITIALIZE_PATH(path);
struct cpu_key max_cpu_key, obj_key;
struct reiserfs_key save_link_key, last_inode_key;
int retval = 0;
struct item_head *ih;
struct buffer_head *bh;
int item_pos;
char *item;
int done;
struct inode *inode;
int truncate;
#ifdef CONFIG_QUOTA
int i;
int ms_active_set;
int quota_enabled[MAXQUOTAS];
#endif
/* compose key to look for "save" links */
max_cpu_key.version = KEY_FORMAT_3_5;
max_cpu_key.on_disk_key.k_dir_id = ~0U;
max_cpu_key.on_disk_key.k_objectid = ~0U;
set_cpu_key_k_offset(&max_cpu_key, ~0U);
max_cpu_key.key_length = 3;
memset(&last_inode_key, 0, sizeof(last_inode_key));
#ifdef CONFIG_QUOTA
/* Needed for iput() to work correctly and not trash data */
if (s->s_flags & MS_ACTIVE) {
ms_active_set = 0;
} else {
ms_active_set = 1;
s->s_flags |= MS_ACTIVE;
}
/* Turn on quotas so that they are updated correctly */
for (i = 0; i < MAXQUOTAS; i++) {
quota_enabled[i] = 1;
if (REISERFS_SB(s)->s_qf_names[i]) {
int ret;
if (sb_has_quota_active(s, i)) {
quota_enabled[i] = 0;
continue;
}
ret = reiserfs_quota_on_mount(s, i);
if (ret < 0)
reiserfs_warning(s, "reiserfs-2500",
"cannot turn on journaled "
"quota: error %d", ret);
}
}
#endif
done = 0;
REISERFS_SB(s)->s_is_unlinked_ok = 1;
while (!retval) {
int depth;
retval = search_item(s, &max_cpu_key, &path);
if (retval != ITEM_NOT_FOUND) {
reiserfs_error(s, "vs-2140",
"search_by_key returned %d", retval);
break;
}
bh = get_last_bh(&path);
item_pos = get_item_pos(&path);
if (item_pos != B_NR_ITEMS(bh)) {
reiserfs_warning(s, "vs-2060",
"wrong position found");
break;
}
item_pos--;
ih = item_head(bh, item_pos);
if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
/* there are no "save" links anymore */
break;
save_link_key = ih->ih_key;
if (is_indirect_le_ih(ih))
truncate = 1;
else
truncate = 0;
/* reiserfs_iget needs k_dirid and k_objectid only */
item = ih_item_body(bh, ih);
obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
obj_key.on_disk_key.k_objectid =
le32_to_cpu(ih->ih_key.k_objectid);
obj_key.on_disk_key.k_offset = 0;
obj_key.on_disk_key.k_type = 0;
pathrelse(&path);
inode = reiserfs_iget(s, &obj_key);
if (!inode) {
/*
* the unlink almost completed, it just did not
* manage to remove "save" link and release objectid
*/
reiserfs_warning(s, "vs-2180", "iget failed for %K",
&obj_key);
retval = remove_save_link_only(s, &save_link_key, 1);
continue;
}
if (!truncate && inode->i_nlink) {
/* file is not unlinked */
reiserfs_warning(s, "vs-2185",
"file %K is not unlinked",
&obj_key);
retval = remove_save_link_only(s, &save_link_key, 0);
continue;
}
depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_initialize(inode);
reiserfs_write_lock_nested(inode->i_sb, depth);
if (truncate && S_ISDIR(inode->i_mode)) {
/*
* We got a truncate request for a dir which
* is impossible. The only imaginable way is to
* execute unfinished truncate request then boot
* into old kernel, remove the file and create dir
* with the same key.
*/
reiserfs_warning(s, "green-2101",
"impossible truncate on a "
"directory %k. Please report",
INODE_PKEY(inode));
retval = remove_save_link_only(s, &save_link_key, 0);
truncate = 0;
iput(inode);
continue;
}
if (truncate) {
REISERFS_I(inode)->i_flags |=
i_link_saved_truncate_mask;
/*
* not completed truncate found. New size was
* committed together with "save" link
*/
reiserfs_info(s, "Truncating %k to %Ld ..",
INODE_PKEY(inode), inode->i_size);
/* don't update modification time */
reiserfs_truncate_file(inode, 0);
retval = remove_save_link(inode, truncate);
} else {
REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
/* not completed unlink (rmdir) found */
reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
if (memcmp(&last_inode_key, INODE_PKEY(inode),
sizeof(last_inode_key))){
last_inode_key = *INODE_PKEY(inode);
/* removal gets completed in iput */
retval = 0;
} else {
reiserfs_warning(s, "super-2189", "Dead loop "
"in finish_unfinished "
"detected, just remove "
"save link\n");
retval = remove_save_link_only(s,
&save_link_key, 0);
}
}
iput(inode);
printk("done\n");
done++;
}
REISERFS_SB(s)->s_is_unlinked_ok = 0;
#ifdef CONFIG_QUOTA
/* Turn quotas off */
reiserfs_write_unlock(s);
for (i = 0; i < MAXQUOTAS; i++) {
if (sb_dqopt(s)->files[i] && quota_enabled[i])
dquot_quota_off(s, i);
}
reiserfs_write_lock(s);
if (ms_active_set)
/* Restore the flag back */
s->s_flags &= ~MS_ACTIVE;
#endif
pathrelse(&path);
if (done)
reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
"Completed\n", done);
return retval;
}
/*
* to protect file being unlinked from getting lost we "safe" link files
* being unlinked. This link will be deleted in the same transaction with last
* item of file. mounting the filesystem we scan all these links and remove
* files which almost got lost
*/
void add_save_link(struct reiserfs_transaction_handle *th,
struct inode *inode, int truncate)
{
INITIALIZE_PATH(path);
int retval;
struct cpu_key key;
struct item_head ih;
__le32 link;
BUG_ON(!th->t_trans_id);
/* file can only get one "save link" of each kind */
RFALSE(truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
"saved link already exists for truncated inode %lx",
(long)inode->i_ino);
RFALSE(!truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
"saved link already exists for unlinked inode %lx",
(long)inode->i_ino);
/* setup key of "save" link */
key.version = KEY_FORMAT_3_5;
key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
key.on_disk_key.k_objectid = inode->i_ino;
if (!truncate) {
/* unlink, rmdir, rename */
set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
set_cpu_key_k_type(&key, TYPE_DIRECT);
/* item head of "safe" link */
make_le_item_head(&ih, &key, key.version,
1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
4 /*length */ , 0xffff /*free space */ );
} else {
/* truncate */
if (S_ISDIR(inode->i_mode))
reiserfs_warning(inode->i_sb, "green-2102",
"Adding a truncate savelink for "
"a directory %k! Please report",
INODE_PKEY(inode));
set_cpu_key_k_offset(&key, 1);
set_cpu_key_k_type(&key, TYPE_INDIRECT);
/* item head of "safe" link */
make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
4 /*length */ , 0 /*free space */ );
}
key.key_length = 3;
/* look for its place in the tree */
retval = search_item(inode->i_sb, &key, &path);
if (retval != ITEM_NOT_FOUND) {
if (retval != -ENOSPC)
reiserfs_error(inode->i_sb, "vs-2100",
"search_by_key (%K) returned %d", &key,
retval);
pathrelse(&path);
return;
}
/* body of "save" link */
link = INODE_PKEY(inode)->k_dir_id;
/* put "save" link into tree, don't charge quota to anyone */
retval =
reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
if (retval) {
if (retval != -ENOSPC)
reiserfs_error(inode->i_sb, "vs-2120",
"insert_item returned %d", retval);
} else {
if (truncate)
REISERFS_I(inode)->i_flags |=
i_link_saved_truncate_mask;
else
REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
}
}
/* this opens transaction unlike add_save_link */
int remove_save_link(struct inode *inode, int truncate)
{
struct reiserfs_transaction_handle th;
struct reiserfs_key key;
int err;
/* we are going to do one balancing only */
err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
if (err)
return err;
/* setup key of "save" link */
key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
key.k_objectid = INODE_PKEY(inode)->k_objectid;
if (!truncate) {
/* unlink, rmdir, rename */
set_le_key_k_offset(KEY_FORMAT_3_5, &key,
1 + inode->i_sb->s_blocksize);
set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
} else {
/* truncate */
set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
}
if ((truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
(!truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
/* don't take quota bytes from anywhere */
reiserfs_delete_solid_item(&th, NULL, &key);
if (!truncate) {
reiserfs_release_objectid(&th, inode->i_ino);
REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
} else
REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
return journal_end(&th);
}
static void reiserfs_kill_sb(struct super_block *s)
{
if (REISERFS_SB(s)) {
reiserfs_proc_info_done(s);
/*
* Force any pending inode evictions to occur now. Any
* inodes to be removed that have extended attributes
* associated with them need to clean them up before
* we can release the extended attribute root dentries.
* shrink_dcache_for_umount will BUG if we don't release
* those before it's called so ->put_super is too late.
*/
shrink_dcache_sb(s);
dput(REISERFS_SB(s)->xattr_root);
REISERFS_SB(s)->xattr_root = NULL;
dput(REISERFS_SB(s)->priv_root);
REISERFS_SB(s)->priv_root = NULL;
}
kill_block_super(s);
}
static void reiserfs_put_super(struct super_block *s)
{
struct reiserfs_transaction_handle th;
th.t_trans_id = 0;
dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
reiserfs_write_lock(s);
/*
* change file system state to current state if it was mounted
* with read-write permissions
*/
if (!(s->s_flags & MS_RDONLY)) {
if (!journal_begin(&th, s, 10)) {
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
1);
set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
REISERFS_SB(s)->s_mount_state);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
}
}
/*
* note, journal_release checks for readonly mount, and can
* decide not to do a journal_end
*/
journal_release(&th, s);
reiserfs_free_bitmap_cache(s);
brelse(SB_BUFFER_WITH_SB(s));
print_statistics(s);
if (REISERFS_SB(s)->reserved_blocks != 0) {
reiserfs_warning(s, "green-2005", "reserved blocks left %d",
REISERFS_SB(s)->reserved_blocks);
}
reiserfs_write_unlock(s);
mutex_destroy(&REISERFS_SB(s)->lock);
destroy_workqueue(REISERFS_SB(s)->commit_wq);
kfree(s->s_fs_info);
s->s_fs_info = NULL;
}
static struct kmem_cache *reiserfs_inode_cachep;
static struct inode *reiserfs_alloc_inode(struct super_block *sb)
{
struct reiserfs_inode_info *ei;
ei = (struct reiserfs_inode_info *)
kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
atomic_set(&ei->openers, 0);
mutex_init(&ei->tailpack);
return &ei->vfs_inode;
}
static void reiserfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
}
static void reiserfs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, reiserfs_i_callback);
}
static void init_once(void *foo)
{
struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
INIT_LIST_HEAD(&ei->i_prealloc_list);
inode_init_once(&ei->vfs_inode);
}
static int __init init_inodecache(void)
{
reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
sizeof(struct
reiserfs_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
init_once);
if (reiserfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(reiserfs_inode_cachep);
}
/* we don't mark inodes dirty, we just log them */
static void reiserfs_dirty_inode(struct inode *inode, int flags)
{
struct reiserfs_transaction_handle th;
int err = 0;
if (inode->i_sb->s_flags & MS_RDONLY) {
reiserfs_warning(inode->i_sb, "clm-6006",
"writing inode %lu on readonly FS",
inode->i_ino);
return;
}
reiserfs_write_lock(inode->i_sb);
/*
* this is really only used for atime updates, so they don't have
* to be included in O_SYNC or fsync
*/
err = journal_begin(&th, inode->i_sb, 1);
if (err)
goto out;
reiserfs_update_sd(&th, inode);
journal_end(&th);
out:
reiserfs_write_unlock(inode->i_sb);
}
static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
{
struct super_block *s = root->d_sb;
struct reiserfs_journal *journal = SB_JOURNAL(s);
long opts = REISERFS_SB(s)->s_mount_opt;
if (opts & (1 << REISERFS_LARGETAIL))
seq_puts(seq, ",tails=on");
else if (!(opts & (1 << REISERFS_SMALLTAIL)))
seq_puts(seq, ",notail");
/* tails=small is default so we don't show it */
if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
seq_puts(seq, ",barrier=none");
/* barrier=flush is default so we don't show it */
if (opts & (1 << REISERFS_ERROR_CONTINUE))
seq_puts(seq, ",errors=continue");
else if (opts & (1 << REISERFS_ERROR_PANIC))
seq_puts(seq, ",errors=panic");
/* errors=ro is default so we don't show it */
if (opts & (1 << REISERFS_DATA_LOG))
seq_puts(seq, ",data=journal");
else if (opts & (1 << REISERFS_DATA_WRITEBACK))
seq_puts(seq, ",data=writeback");
/* data=ordered is default so we don't show it */
if (opts & (1 << REISERFS_ATTRS))
seq_puts(seq, ",attrs");
if (opts & (1 << REISERFS_XATTRS_USER))
seq_puts(seq, ",user_xattr");
if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
seq_puts(seq, ",expose_privroot");
if (opts & (1 << REISERFS_POSIXACL))
seq_puts(seq, ",acl");
if (REISERFS_SB(s)->s_jdev)
seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
if (journal->j_max_commit_age != journal->j_default_max_commit_age)
seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
#ifdef CONFIG_QUOTA
if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
else if (opts & (1 << REISERFS_USRQUOTA))
seq_puts(seq, ",usrquota");
if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
else if (opts & (1 << REISERFS_GRPQUOTA))
seq_puts(seq, ",grpquota");
if (REISERFS_SB(s)->s_jquota_fmt) {
if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
seq_puts(seq, ",jqfmt=vfsold");
else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
seq_puts(seq, ",jqfmt=vfsv0");
}
#endif
/* Block allocator options */
if (opts & (1 << REISERFS_NO_BORDER))
seq_puts(seq, ",block-allocator=noborder");
if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
seq_puts(seq, ",block-allocator=no_unhashed_relocation");
if (opts & (1 << REISERFS_HASHED_RELOCATION))
seq_puts(seq, ",block-allocator=hashed_relocation");
if (opts & (1 << REISERFS_TEST4))
seq_puts(seq, ",block-allocator=test4");
show_alloc_options(seq, s);
return 0;
}
#ifdef CONFIG_QUOTA
static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
size_t, loff_t);
static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
loff_t);
#endif
static const struct super_operations reiserfs_sops = {
.alloc_inode = reiserfs_alloc_inode,
.destroy_inode = reiserfs_destroy_inode,
.write_inode = reiserfs_write_inode,
.dirty_inode = reiserfs_dirty_inode,
.evict_inode = reiserfs_evict_inode,
.put_super = reiserfs_put_super,
.sync_fs = reiserfs_sync_fs,
.freeze_fs = reiserfs_freeze,
.unfreeze_fs = reiserfs_unfreeze,
.statfs = reiserfs_statfs,
.remount_fs = reiserfs_remount,
.show_options = reiserfs_show_options,
#ifdef CONFIG_QUOTA
.quota_read = reiserfs_quota_read,
.quota_write = reiserfs_quota_write,
#endif
};
#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
static int reiserfs_write_dquot(struct dquot *);
static int reiserfs_acquire_dquot(struct dquot *);
static int reiserfs_release_dquot(struct dquot *);
static int reiserfs_mark_dquot_dirty(struct dquot *);
static int reiserfs_write_info(struct super_block *, int);
static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
static const struct dquot_operations reiserfs_quota_operations = {
.write_dquot = reiserfs_write_dquot,
.acquire_dquot = reiserfs_acquire_dquot,
.release_dquot = reiserfs_release_dquot,
.mark_dirty = reiserfs_mark_dquot_dirty,
.write_info = reiserfs_write_info,
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
};
static const struct quotactl_ops reiserfs_qctl_operations = {
.quota_on = reiserfs_quota_on,
.quota_off = dquot_quota_off,
.quota_sync = dquot_quota_sync,
.get_info = dquot_get_dqinfo,
.set_info = dquot_set_dqinfo,
.get_dqblk = dquot_get_dqblk,
.set_dqblk = dquot_set_dqblk,
};
#endif
static const struct export_operations reiserfs_export_ops = {
.encode_fh = reiserfs_encode_fh,
.fh_to_dentry = reiserfs_fh_to_dentry,
.fh_to_parent = reiserfs_fh_to_parent,
.get_parent = reiserfs_get_parent,
};
/*
* this struct is used in reiserfs_getopt () for containing the value for
* those mount options that have values rather than being toggles.
*/
typedef struct {
char *value;
/*
* bitmask which is to set on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
*/
int setmask;
/*
* bitmask which is to clear on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
* This is applied BEFORE setmask
*/
int clrmask;
} arg_desc_t;
/* Set this bit in arg_required to allow empty arguments */
#define REISERFS_OPT_ALLOWEMPTY 31
/*
* this struct is used in reiserfs_getopt() for describing the
* set of reiserfs mount options
*/
typedef struct {
char *option_name;
/* 0 if argument is not required, not 0 otherwise */
int arg_required;
/* list of values accepted by an option */
const arg_desc_t *values;
/*
* bitmask which is to set on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
*/
int setmask;
/*
* bitmask which is to clear on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
* This is applied BEFORE setmask
*/
int clrmask;
} opt_desc_t;
/* possible values for -o data= */
static const arg_desc_t logging_mode[] = {
{"ordered", 1 << REISERFS_DATA_ORDERED,
(1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
{"journal", 1 << REISERFS_DATA_LOG,
(1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
{"writeback", 1 << REISERFS_DATA_WRITEBACK,
(1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
{.value = NULL}
};
/* possible values for -o barrier= */
static const arg_desc_t barrier_mode[] = {
{"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
{"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
{.value = NULL}
};
/*
* possible values for "-o block-allocator=" and bits which are to be set in
* s_mount_opt of reiserfs specific part of in-core super block
*/
static const arg_desc_t balloc[] = {
{"noborder", 1 << REISERFS_NO_BORDER, 0},
{"border", 0, 1 << REISERFS_NO_BORDER},
{"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
{"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
{"test4", 1 << REISERFS_TEST4, 0},
{"notest4", 0, 1 << REISERFS_TEST4},
{NULL, 0, 0}
};
static const arg_desc_t tails[] = {
{"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
{"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
{"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
{NULL, 0, 0}
};
static const arg_desc_t error_actions[] = {
{"panic", 1 << REISERFS_ERROR_PANIC,
(1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
{"ro-remount", 1 << REISERFS_ERROR_RO,
(1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
{"continue", 1 << REISERFS_ERROR_CONTINUE,
(1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
#endif
{NULL, 0, 0},
};
/*
* proceed only one option from a list *cur - string containing of mount
* options
* opts - array of options which are accepted
* opt_arg - if option is found and requires an argument and if it is specifed
* in the input - pointer to the argument is stored here
* bit_flags - if option requires to set a certain bit - it is set here
* return -1 if unknown option is found, opt->arg_required otherwise
*/
static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
char **opt_arg, unsigned long *bit_flags)
{
char *p;
/*
* foo=bar,
* ^ ^ ^
* | | +-- option_end
* | +-- arg_start
* +-- option_start
*/
const opt_desc_t *opt;
const arg_desc_t *arg;
p = *cur;
/* assume argument cannot contain commas */
*cur = strchr(p, ',');
if (*cur) {
*(*cur) = '\0';
(*cur)++;
}
if (!strncmp(p, "alloc=", 6)) {
/*
* Ugly special case, probably we should redo options
* parser so that it can understand several arguments for
* some options, also so that it can fill several bitfields
* with option values.
*/
if (reiserfs_parse_alloc_options(s, p + 6)) {
return -1;
} else {
return 0;
}
}
/* for every option in the list */
for (opt = opts; opt->option_name; opt++) {
if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
if (bit_flags) {
if (opt->clrmask ==
(1 << REISERFS_UNSUPPORTED_OPT))
reiserfs_warning(s, "super-6500",
"%s not supported.\n",
p);
else
*bit_flags &= ~opt->clrmask;
if (opt->setmask ==
(1 << REISERFS_UNSUPPORTED_OPT))
reiserfs_warning(s, "super-6501",
"%s not supported.\n",
p);
else
*bit_flags |= opt->setmask;
}
break;
}
}
if (!opt->option_name) {
reiserfs_warning(s, "super-6502",
"unknown mount option \"%s\"", p);
return -1;
}
p += strlen(opt->option_name);
switch (*p) {
case '=':
if (!opt->arg_required) {
reiserfs_warning(s, "super-6503",
"the option \"%s\" does not "
"require an argument\n",
opt->option_name);
return -1;
}
break;
case 0:
if (opt->arg_required) {
reiserfs_warning(s, "super-6504",
"the option \"%s\" requires an "
"argument\n", opt->option_name);
return -1;
}